C/2016 T3 (PANSTARRS)
| Parameter |
Value |
| Designation |
C/2016 T3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2017-09-06T23:30:05.921280Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:27Z |
| Obs used |
436 |
| NEO |
- |
| M1 |
13.700 |
| K1 |
4.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-06-25.0000000 |
| e |
0.98138749 |
| q (au) |
2.649481 |
| a (au) |
142.349476 |
| i (deg) |
22.675960 |
| Ω (om, deg) |
271.748362 |
| ω (w, deg) |
194.677924 |
| M (ma, deg) |
359.957068 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.344 + 2.067\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.344 |
| n |
2.067 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| δ90 |
10.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2016-10-10 |
2017-09-06 |
+7.4124 |
-4.382 |
| 2017-09-17 |
2018-04-18 |
+5.6541 |
-2.485 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
16:27:02.67 |
-31:21:28.3 |
HIP 80556 |
8.11 |
| 2026-02-03 12:00 |
16:27:06.11 |
-31:21:45.0 |
HIP 80556 |
8.65 |
| 2026-02-04 00:00 |
16:27:09.50 |
-31:22:01.6 |
HIP 80556 |
9.21 |
| 2026-02-04 12:00 |
16:27:12.84 |
-31:22:18.1 |
HIP 80556 |
9.80 |
| 2026-02-05 00:00 |
16:27:16.13 |
-31:22:34.6 |
HIP 80556 |
10.40 |
| 2026-02-05 12:00 |
16:27:19.37 |
-31:22:51.0 |
HIP 80556 |
11.02 |
| 2026-02-06 00:00 |
16:27:22.55 |
-31:23:07.4 |
HIP 80556 |
11.64 |
| 2026-02-06 12:00 |
16:27:25.69 |
-31:23:23.7 |
HIP 80556 |
12.27 |
| 2026-02-07 00:00 |
16:27:28.77 |
-31:23:40.0 |
HIP 80556 |
12.90 |
| 2026-02-07 12:00 |
16:27:31.80 |
-31:23:56.2 |
HIP 80556 |
13.53 |
| 2026-02-08 00:00 |
16:27:34.78 |
-31:24:12.3 |
HIP 80556 |
14.16 |
| 2026-02-08 12:00 |
16:27:37.71 |
-31:24:28.4 |
HIP 80556 |
14.78 |
| 2026-02-09 00:00 |
16:27:40.58 |
-31:24:44.4 |
HIP 80556 |
15.40 |
| 2026-02-09 12:00 |
16:27:43.40 |
-31:25:00.4 |
HIP 80556 |
16.02 |
| 2026-02-10 00:00 |
16:27:46.17 |
-31:25:16.3 |
HIP 80556 |
16.63 |
| 2026-02-10 12:00 |
16:27:48.88 |
-31:25:32.1 |
HIP 80556 |
17.23 |
| 2026-02-11 00:00 |
16:27:51.54 |
-31:25:47.9 |
HIP 80556 |
17.83 |
| 2026-02-11 12:00 |
16:27:54.15 |
-31:26:03.6 |
HIP 80556 |
18.42 |
| 2026-02-12 00:00 |
16:27:56.70 |
-31:26:19.2 |
HIP 80556 |
19.00 |
| 2026-02-12 12:00 |
16:27:59.20 |
-31:26:34.7 |
HIP 80683 |
19.34 |
| 2026-02-13 00:00 |
16:28:01.64 |
-31:26:50.2 |
HIP 80683 |
19.47 |
| 2026-02-13 12:00 |
16:28:04.03 |
-31:27:05.6 |
HIP 80683 |
19.62 |
| 2026-02-14 00:00 |
16:28:06.36 |
-31:27:21.0 |
HIP 80683 |
19.78 |
| 2026-02-14 12:00 |
16:28:08.64 |
-31:27:36.2 |
HIP 80683 |
19.96 |
| 2026-02-15 00:00 |
16:28:10.86 |
-31:27:51.4 |
HIP 80683 |
20.15 |
| 2026-02-15 12:00 |
16:28:13.03 |
-31:28:06.5 |
HIP 80683 |
20.36 |
| 2026-02-16 00:00 |
16:28:15.14 |
-31:28:21.5 |
HIP 80683 |
20.57 |
| 2026-02-16 12:00 |
16:28:17.20 |
-31:28:36.5 |
HIP 80683 |
20.80 |
| 2026-02-17 00:00 |
16:28:19.20 |
-31:28:51.3 |
HIP 80683 |
21.03 |
| 2026-02-17 12:00 |
16:28:21.14 |
-31:29:06.1 |
HIP 80683 |
21.28 |
| 2026-02-18 00:00 |
16:28:23.03 |
-31:29:20.8 |
HIP 80683 |
21.52 |
| 2026-02-18 12:00 |
16:28:24.86 |
-31:29:35.4 |
HIP 80683 |
21.78 |
| 2026-02-19 00:00 |
16:28:26.64 |
-31:29:49.9 |
HIP 80683 |
22.04 |
| 2026-02-19 12:00 |
16:28:28.35 |
-31:30:04.3 |
HIP 80683 |
22.30 |
| 2026-02-20 00:00 |
16:28:30.02 |
-31:30:18.7 |
HIP 80683 |
22.56 |
| 2026-02-20 12:00 |
16:28:31.62 |
-31:30:32.9 |
HIP 80683 |
22.83 |
| 2026-02-21 00:00 |
16:28:33.17 |
-31:30:47.1 |
HIP 80683 |
23.10 |
| 2026-02-21 12:00 |
16:28:34.66 |
-31:31:01.2 |
HIP 80683 |
23.37 |
| 2026-02-22 00:00 |
16:28:36.09 |
-31:31:15.1 |
HIP 80683 |
23.64 |
| 2026-02-22 12:00 |
16:28:37.47 |
-31:31:29.0 |
HIP 80683 |
23.91 |
| 2026-02-23 00:00 |
16:28:38.79 |
-31:31:42.8 |
HIP 80683 |
24.18 |
| 2026-02-23 12:00 |
16:28:40.05 |
-31:31:56.5 |
HIP 80683 |
24.45 |
| 2026-02-24 00:00 |
16:28:41.25 |
-31:32:10.1 |
HIP 80683 |
24.71 |